From the larian valut, the only DRM is an activation to install. This can be done via phone if necessary. You are allowed 3 computers to have the game installed. Larian used a patch to remove the DRM from BD and the latest build on DD has no DRM.
You'll have to look at the FAQ's or fine print from fileplanet's direct-to-drive for their DRM information.
Got mine from Larian Valut as they get the funds in a more direct manner.
